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Chirality

Chirality

Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...

Molecules with Multiple Chiral Centers

Molecules with Multiple Chiral Centers

Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...

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Multidimensional tunable graphene chiral metasurface based on coherent control.

Wanli Zhao, Ming Chen, Xiangyang Wang

|September 29, 2023

Summary

We developed a tunable chiral graphene metasurface offering flexible control over terahertz waves. This advanced metasurface achieves high circular dichroism and tunable frequencies for applications like near-field imaging.

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Area of Science:

Optics and Photonics
Materials Science
Nanotechnology

Background:

Chiral metasurfaces are crucial for advanced optical applications but often lack flexibility.
Existing designs struggle to meet the demands for tunable and multidimensional control.

Purpose of the Study:

To propose and demonstrate a multidimensional tunable chiral graphene metasurface.
To achieve high circular conversion dichroism (CCD) with flexible frequency and amplitude modulation.

Main Methods:

Utilized coherent control techniques for tunable properties.
Employed numerical simulations to analyze differential absorption mechanisms.
Fabricated a transmission-type metasurface structure.

Main Results:

Achieved over 0.8 circular conversion dichroism (CCD) at 2.4 THz.
Demonstrated tunable operating frequency from 1.3 THz to 2.4 THz.
Obtained near-perfect amplitude modulation depth (0-0.8) and easy access to reverse CCD.

Conclusions:

The proposed graphene metasurface offers unprecedented flexibility and multidimensional tunability.
The device shows promise for applications in near-field imaging and other advanced optical systems.
This work expands the design space for chiral metasurfaces with enhanced degrees of freedom.